Care to share any negative experiences you have (implied with the use of the ellipsis) with the MOS?
My experience with it has been great so far. There have been no malfunctions in the several hundred rounds I've put through it so far.
It's an engineering failure. It will not hold up to any hard use. They milled it too deep and the use of the mounting plate lends itself to being a weakness. The sights are pointless since the RDS sits higher than it should, so you have to buy different BUIS. Why on earth would they even sell it like that. It just seems like they made a half ass attempt to get into the RDS business.